CN112029174B - Continuous fiber reinforced composite material auxetic structure and preparation method thereof - Google Patents
Continuous fiber reinforced composite material auxetic structure and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a continuous fiber reinforced composite material auxetic structure and a preparation method thereof, which adopt a continuous path planning strategy and use a thermosensitive shape memory polymer and a conductive continuous fiber material to realize multifunctional integrated low-cost rapid molding integrating auxetic effect, shape memory characteristic, autonomous regulation and control function, health self-monitoring and the like.
Description
Technical Field
The invention belongs to the technical field of mechanical metamaterials, and particularly relates to a continuous fiber reinforced composite material auxetic structure and a preparation method thereof.
Background
The auxetic structure is gradually becoming a research hotspot of mechanical workers at home and abroad due to the excellent performances of the auxetic structure in the aspects of compressive strength, shear modulus, indentation resistance, fracture toughness, impact energy absorption and the like. The auxetic structure prepared by using conventional materials is difficult to control the deformation path of the structure, and the deformation recovery and secondary utilization of the structure cannot be realized. Due to the complexity of the structure, the overall structure is difficult to manufacture. The preparation period is relatively long.
The shape memory polymer is used as an important intelligent material and has great development potential in the fields of aerospace, flexible electronics, medical instruments, underwater robots and the like. The method is limited by the defects of low mechanical properties such as specific stiffness, specific strength and the like of the shape memory polymer, poor motion reliability and low restoring force in the deformation process, and the practical application of the shape memory polymer is not popularized in a large scale. The fiber-reinforced shape memory polymer composite material can effectively make up the defects and has better mechanical properties such as rigidity, strength and the like.
However, due to the difference in mechanical properties between the fiber bundle and the matrix in the fiber-reinforced shape memory polymer composite, when a large load is applied, the composite may be damaged by cracking and delamination of the matrix, fiber pulling out and debonding, and fracture. Such damage in composite structures may occur within the structure, and damage concealed within the structure is generally not easily observable or detectable, which may lead to significant safety hazards.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a continuous fiber reinforced composite material auxetic structure with shape memory effect and health self-monitoring function and a preparation method thereof, aiming at the defects in the prior art, so as to realize low-cost rapid molding integrating the functions of auxetic effect, shape memory property, autonomous regulation and control function, health self-monitoring, and the like.
The invention adopts the following technical scheme:
the continuous fiber reinforced composite material auxetic structure comprises an inwards concave honeycomb structure and a chiral lattice, wherein single cells of the inwards concave honeycomb structure or single cells of the chiral lattice are connected to form geometric single cells, and a plurality of geometric single cells are periodically auxetic to form the continuous fiber reinforced composite material auxetic structure.
Specifically, the side of the single cell single-layer wall thickness of the concave honeycomb structure forms an acute angle theta with a horizontal line, the theta is 0-90 degrees, the single cells of the concave honeycomb structure are connected through a concave honeycomb structure basic rod piece, the single cells of the chiral lattice are connected through a chiral lattice basic rod piece, the concave honeycomb structure basic rod piece and the chiral lattice basic rod piece form an acute angle beta with an edge line, and the beta is 0-45 degrees.
Furthermore, the cross structures of the basic rod pieces with the concave honeycomb structure and the basic rod pieces with the chiral lattice adopt a cross, star or cross connection mode.
Specifically, the concave honeycomb structure and the chiral lattice are formed by alternately adopting single-layer and double-layer structure wall thicknesses.
Furthermore, the single-layer and double-layer structure is made of a thermoplastic matrix and continuous fibers, the wall thickness of the single layer is 1.38mm, and the wall thickness of the double layer is 2.36 mm.
According to another technical scheme, the method for preparing the continuous fiber reinforced composite material auxetic structure comprises the following steps:
s1, determining relevant adjustable geometric parameters of the continuous fiber reinforced composite material auxetic structure, drawing an inwards concave honeycomb structure and a chiral lattice model, converting the inwards concave honeycomb structure and the chiral lattice model into STL format data and exporting the STL format data;
s2, performing digital cross section slicing on the data model of the STL format data obtained in the step S1, importing the sliced data into computer-aided software, processing node information, planning a printing path, and compiling a path G code to obtain a data file matched with printing equipment;
s3, determining printing process parameters of the fused deposition method, selecting conductive continuous fibers and heat-sensitive shape memory polymer raw materials, and printing layer by layer according to the data matched with the printing equipment obtained in the step S2 to obtain the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function.
Specifically, in step S1, the relevant adjustable geometric parameters include the lengths of the concave honeycomb structure and the single rods of the chiral lattice, the wall thickness of the single-layer and double-layer structure formed by the thermoplastic matrix and the continuous fibers, the acute angle formed by the side of the single-layer wall thickness of the concave honeycomb structure unit cells and the horizontal line, the acute angle formed by the rods and the edge line used for connecting the single-layer wall thickness of the concave honeycomb structure unit cells and the height of the single-layer concave honeycomb structure and the chiral lattice.
Specifically, in step S3, the printing process parameters include a printing speed, a printing temperature, a platform temperature and a packing density, the printing speed is 30-100 mm/min, the printing temperature is 200-210 ℃, the platform temperature is 35-50 ℃, and the packing density is 60% -100%.
Specifically, in step S3, the electrically conductive continuous fibers include metal fiber filaments and carbon fibers; the heat-sensitive shape memory polymer includes shape cross-linked polyethylene, copolyamide, polyurethane, polycaprolactone, polynorbornene, trans-1, 4-polyisoprene, styrene-butadiene copolymer, ethylene/vinyl acetate copolymer and fluorine-containing polymer.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a continuous fiber reinforced composite material auxetic structure with a shape memory effect and a health self-monitoring function and a preparation method thereof. Experiments show that the material has a negative Poisson ratio effect under the action of compressive loads in two directions in a plane, the continuous fibers inhibit the expansion of cracks in a matrix, the breakage of a rod piece is prevented, the structure is prevented from being crushed, the stress has a longer platform area in the compression in the 1-direction, the stress has a multi-platform effect in the compression in the 2-direction, and the material has considerable advantages in the aspect of energy absorption and is a new-generation light metamaterial with great prospect.
Furthermore, the continuous fiber reinforced composite material auxetic structure unit cell with the shape memory effect and the health self-monitoring function takes the concave honeycomb and the chiral lattice as examples, the two structures are auxetic structures with great development potential in engineering, the structure form is simple, the geometric parameters are clear, and the manufacture and the popularization are easy.
Furthermore, the single cell of the continuous fiber reinforced composite structure with the shape memory effect and the health self-monitoring function has the advantages that the acute angle formed by the side where the single cell single-layer wall thickness of the concave honeycomb structure is located and the horizontal line is the same and is 0-90 degrees, the single cells of the chiral lattice are connected through the rod piece, the acute angle formed by the rod piece and the edge line is the same and is 0-45 degrees, and the angle adjustment is favorable for structural performance adjustment design and multifunctional integration.
Furthermore, the selected thermoplastic matrix is a heat-sensitive shape memory polymer, such as shape cross-linked polyethylene, copolyamide, Polyurethane (PU), polycaprolactone, polynorbornene, trans-1, 4-polyisoprene, styrene-butadiene copolymer, ethylene/vinyl acetate copolymer, fluorine-containing high polymer and the like, and according to the actual temperature requirement and the strength standard, the matrix material can be freely selected, so that the material advantages are fully exerted, and the structural performance is improved.
Furthermore, the used continuous fibers are conductive fibers, such as metal fiber wires (shape memory alloy NiTi, 14-PH stainless steel, TC4 titanium alloy, IN718 and the like), carbon fibers and the like, the types of the fibers can be selected according to actual cost and voltage requirements, and internal fiber paths, content and the like are designed, so that the flexibility and selectivity are strong, and the application scene is wide.
Furthermore, the length of the concave honeycomb structure and the chiral lattice single rod piece, the wall thickness of a single-double-layer structure formed by the thermoplastic matrix and the continuous fibers, the edge of the single-layer wall thickness of the concave honeycomb structure and the horizontal line form an acute angle, the rod piece used for being connected with each other between the chiral lattice single cells and the edge line form an acute angle, the heights of the single-layer concave honeycomb structure and the chiral lattice and the like are adjustable parameters, the design of the structure is favorably improved, and the energy absorption capacity of the structure is improved.
Furthermore, the continuous fibers penetrate through the whole structure, so that the complete recovery and secondary utilization of subsequent fibers are facilitated.
Furthermore, for the crossed structure of the multi-rod piece, lapping methods such as cross, star cross and cross in a shape like a Chinese character 'mi' are adopted; the rod pieces with larger stress in the structure are printed side by side to form multi-arm rod pieces, so that the wall thickness is increased, or the same path is repeatedly printed for multiple times, so that the fiber content is increased, and the structural strength can be effectively improved.
Further, the shape memory polymer composite auxetic structure based on the conductive fiber can realize on-site nondestructive self-structure health monitoring. If the structure is deformed under force or damaged externally, the resistance of the structure material changes instantly. Structural health monitors allow for health monitoring of the structure when the structural material is subjected to shock, vibration, and other stresses and strains.
The invention also discloses a continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function and a preparation method thereof, and the 3D printing technology is adopted to realize integrated molding of the structure, so that the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function and the preparation method thereof can realize complex configuration design and adjustment, the design and flexibility are enhanced, the preparation steps are simplified, the production period is shortened, and the preparation cost is reduced.
In conclusion, the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function and the preparation method thereof are realized, the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function is obtained, the auxetic structure integrates the auxetic effect, the shape memory characteristic, the autonomous regulation and control function, the health self-monitoring function and other functions, the designability is strong, the preparation period is short, and the continuous fiber reinforced composite material auxetic structure has wide application prospects in the fields of aerospace, high-end equipment and national defense and military.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of a printing path according to the present invention, wherein (a) is a concave honeycomb structure and (b) is a chiral lattice;
FIG. 2 is a schematic diagram of a unit cell structure of the present invention, wherein (a) is a concave honeycomb unit cell and (b) is a chiral lattice unit cell;
FIG. 3 is a schematic diagram of the printing principle and the printing process of the present invention, wherein (a) is an indent honeycomb structure and (b) is a chiral lattice;
FIG. 4 is a nominal stress-strain curve under in-plane compressive loading in accordance with the present invention;
FIG. 5 is a graph of Poisson's ratio as a function of nominal strain under in-plane compressive loading in accordance with the present invention;
fig. 6 is a diagram showing a deformation mode of the present invention under an in-plane compressive load.
Wherein: 1. an inwardly concave honeycomb structure; 2. a chiral lattice; 3. an inner concave honeycomb structure basic rod piece; 4. a continuous fiber; 5. a thermoplastic matrix; 6. the chiral lattice is basically a rod.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the present invention provides a continuous fiber reinforced composite material auxetic structure, which is a periodic auxetic structure using an inwardly concave honeycomb structure 1 and a chiral lattice 2 as geometric unit cells, wherein a basic rod unit is made of a fiber reinforced shape memory polymer composite material, a continuous fiber 4 penetrates through the whole structure, and the whole structure is integrally formed by a 3D printing technology.
A chiral structure refers to a structure that is not identical to a mirror image of the structure itself and does not coincide. In the invention, chiral structure unit cells are arranged into a single-layer lattice form, which is called a chiral lattice.
Referring to fig. 2, the single-cell single-layer wall thickness of the concave honeycomb structure 1 is at the same side of an acute angle theta with a horizontal line, the included angle theta is 0-90 degrees, the single cells of the concave honeycomb structure 1 are connected through a concave honeycomb structure basic rod piece 3, the single cells of the chiral lattice 2 are connected through a chiral lattice basic rod piece (6), the acute angles beta formed by the concave honeycomb structure basic rod piece 3 and the chiral lattice basic rod piece 6 with edge lines are the same, the included angle beta is 0-45 degrees, and the concave honeycomb structure 1 and the chiral lattice 2 are formed by alternately adopting single-layer and double-layer wall thicknesses;
the length of the rod piece of the concave honeycomb structure 1 and the chiral lattice 2 is single, the thermoplastic matrix 5 is a heat-sensitive shape memory polymer, and the thickness of the wall of the single-double layer structure formed by the thermoplastic matrix 5 and the continuous fibers 4 is thick.
The heights of the single-layer concave honeycomb structure 1 and the chiral lattice 2, namely the height perpendicular to the printing platform direction in fig. 3 are adjustable parameters.
The length of the concave honeycomb structure and the length of the chiral lattice basic rod piece can be customized according to the size and strength requirements of an actual structural design, the wall thickness of a single-double-layer structure formed by a thermoplastic matrix and continuous fibers is determined by the setting parameters of an actually used printer, the wall thickness provided by the invention is only used as a reference, the acute angle formed by the edge of the single-cell single-layer wall thickness of the concave honeycomb structure 1 and the horizontal line is 0-90 degrees, the single cells of the chiral lattice 2 are connected through the chiral lattice basic rod piece 6, the acute angle formed by the chiral lattice basic rod piece 6 and the edge line is 0-45 degrees, and the height of the single-layer concave honeycomb structure and the chiral lattice, namely the height perpendicular to the printing platform direction of the graph 3, is customized according to the actual size requirements.
Referring to fig. 3, before printing, node information is processed by FDM (fused deposition modeling), nodes are sequenced by a "one stroke" method of head-to-tail sequence traversal, so as to obtain a continuous printing path of a continuous fiber reinforced composite material auxetic structure with shape memory effect and health self-monitoring function, and a path G code is written.
For the crossed structure of the multi-rod piece, lapping methods such as cross, star cross, meter cross and the like are adopted; the rods with larger stress in the structure are printed side by side to form a multi-arm rod to increase the wall thickness or the fiber content is increased by repeatedly printing the multi-arm rod in the same path.
The invention relates to a continuous fiber reinforced composite material auxetic structure with shape memory effect and health self-monitoring function and a preparation method thereof, which comprises the following steps of firstly drawing an inwards concave honeycomb structure and a chiral dot matrix model, then slicing the digital cross section of the data model to obtain slice data, importing the slice data into computer-aided software, processing node information, planning a printing path, compiling a path G code to obtain a data file matched with printing equipment, selecting continuous fibers and heat-sensitive shape memory polymer raw materials according to conditions, and integrally processing and molding through an FDM printer to obtain the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function, wherein the specific steps are as follows:
s1, determining relevant adjustable geometric parameters of the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function, drawing a three-dimensional data model of the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function, converting the three-dimensional data model into STL format data and exporting the STL format data;
the relevant adjustable geometric parameters include, but are not limited to, the lengths of the concave honeycomb structure and the chiral lattice single rod pieces, the wall thickness of a single-double-layer structure formed by the thermoplastic matrix and the continuous fibers, an acute angle formed by the edge of the single-layer wall thickness of the concave honeycomb structure single cells and a horizontal line, an acute angle formed by the rod pieces and edge lines which are used for being connected with each other among the chiral lattice single cells, and the heights of the single-layer concave honeycomb structure and the chiral lattice.
The length of the concave honeycomb structure and the length of the single rod piece of the chiral structure can be customized according to the size and the strength requirement of the actual structural design, the wall thickness of the single-double-layer structure formed by the thermoplastic matrix and the continuous fibers is determined by the setting parameters of the printer used actually, the wall thickness provided by the invention is only used as a reference, the acute angle formed by the edge of the single-cell single-layer wall thickness of the concave honeycomb structure 1 and the horizontal line is 0-90 degrees, the single cells of the chiral lattice 2 are connected through the chiral lattice basic rod piece 6, the acute angle formed by the chiral lattice basic rod piece 6 and the edge line is 0-45 degrees, and the height of the single-layer concave honeycomb structure and the chiral lattice, namely the height perpendicular to the direction of the printing platform of the graph 3, is customized according to the actual size requirement.
S2, performing digital cross section slicing on the data model of the STL format data obtained in the step S1, importing the sliced data into computer-aided software, processing node information, planning a printing path, and compiling a path G code to obtain a data file matched with printing equipment;
s3, determining printing process parameters of the FDM technology, selecting conductive continuous fibers and heat-sensitive shape memory polymer raw materials, and printing layer by layer according to the data matched with the printing equipment obtained in the step S2 to obtain a continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function;
the FDM technology printing process parameters include printing speed, printing temperature, platen temperature, and fill density.
Electrically conductive continuous fibers include metal fiber filaments (shape memory alloy NiTi, 14-PH stainless steel, TC4 titanium alloy, IN718, etc.) and carbon fibers, including but not limited to the electrically conductive fiber types listed above.
The heat-sensitive shape memory polymer includes shape cross-linked polyethylene, copolyamide, Polyurethane (PU), polycaprolactone, polynorbornene, trans-1, 4-polyisoprene, styrene-butadiene copolymer, ethylene/vinyl acetate copolymer, fluoropolymer, and the like, including but not limited to the above-listed heat-sensitive shape memory polymer types.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) And (3) drawing a three-dimensional data model of the concave honeycomb structure by using commercial three-dimensional modeling software SolidWorks. An acute angle formed by the side of the single-layer wall thickness of the concave honeycomb structure unit cell and a horizontal line is 30 degrees, the thickness of the single-layer shape memory polymer is 0.46mm, the thickness of the single-layer fiber is 0.46mm, the height of the concave honeycomb structure unit cell is 20.52mm, the length of the concave rod is 8.45mm, a geometric model of the concave honeycomb structure unit cell unit.
(2) Performing digital cross section slicing on the data model of the STL format data obtained in the step S1, importing the sliced data into computer-aided software, processing node information, planning a printing path, and compiling a path G code to obtain a data file matched with printing equipment;
(3) and (3) importing the data file obtained in the last step into a COMBOT-200 desktop continuous fiber reinforced composite material 3D printer, adopting a Fused Deposition Method (FDM)3D printing technology, taking continuous carbon fibers and a heat-sensitive shape memory polymer as raw materials, printing at 210 ℃, at a printing speed of 100mm/min, at a layering thickness of 0.2mm, at a laying speed of 100mm/min and at a scanning interval of 1mm, and finally obtaining the integrally formed concave honeycomb structure.
Example 2
(1) And (3) drawing a three-dimensional data model of the chiral dot matrix by using commercial three-dimensional modeling software SolidWorks. An acute angle formed by the rod pieces used for mutual connection between the chiral lattice unit cells and the edge lines is 30 degrees, the thickness of the single-layer shape memory polymer is 0.46mm, the thickness of the single-layer fiber is 0.46mm, the geometric model of the single-layer shape memory polymer is shown as a figure 2(b), and the drawn three-dimensional data model is converted into STL format data and is exported.
(2) Performing digital cross section slicing on the data model of the STL format data obtained in the step S1, importing the sliced data into computer-aided software, processing node information, planning a printing path, and compiling a path G code to obtain a data file matched with printing equipment;
(3) and (3) importing the data file obtained in the last step into a COMBOT-200 desktop continuous fiber reinforced composite material 3D printer, adopting a Fused Deposition Method (FDM)3D printing technology, taking continuous carbon fibers and a heat-sensitive shape memory polymer as raw materials, printing at 210 ℃, at a printing speed of 100mm/min, at a layering thickness of 0.2mm, at a laying speed of 100mm/min and at a scanning interval of 1mm, and finally obtaining an integrally formed chiral dot matrix.
Referring to fig. 4 and 5, experiments show that the continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function has a negative poisson ratio effect under the action of compressive loads in two directions in a plane, the existence of the continuous fibers inhibits the expansion of cracks in a matrix, prevents a rod from breaking, prevents the structure from being crushed, has a longer platform region for stress in the 1-direction compression, has a multi-platform effect for stress in the 2-direction compression, has considerable advantages in energy absorption, and is a new generation of light metamaterial with great prospect.
Referring to fig. 6, the resistance and stress of the continuous fiber reinforced composite auxetic structure with shape memory effect and self-health monitoring function change with strain during the compression process, so that self-health monitoring and abnormal alarm can be realized when the structural material is subjected to impact, vibration, and other stresses and strains.
In conclusion, the continuous fiber reinforced composite material auxetic structure and the preparation method thereof integrate the auxetic effect, the shape memory characteristic, the autonomous regulation and control function, the health self-monitoring function and other functions into a whole, have good energy absorption and buffering characteristics, can realize autonomous regulation in the deformation process, realize the structural health self-monitoring in the load bearing process, have strong designability and short preparation period, and have wide application prospects.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (4)
1. A method of making a continuous fiber reinforced composite auxetic structure comprising the steps of:
s1, determining relevant adjustable geometric parameters of the continuous fiber reinforced composite material auxetic structure, drawing an inwards concave honeycomb structure and a chiral lattice model, converting the inwards concave honeycomb structure and the chiral lattice model into STL format data and exporting the STL format data;
s2, performing digital cross section slicing on the data model of the STL format data obtained in the step S1, importing the sliced data into computer-aided software, processing node information, planning a printing path, and compiling a path G code to obtain a data file matched with printing equipment;
s3, determining printing process parameters of the fused deposition method, selecting conductive continuous fibers and heat-sensitive shape memory polymer raw materials, and printing layer by layer according to the data matched with the printing equipment obtained in the step S2 to obtain a continuous fiber reinforced composite material auxetic structure with the shape memory effect and the health self-monitoring function;
the continuous fiber reinforced composite material auxetic structure comprises an inwards concave honeycomb structure (1) and a chiral lattice (2), a geometric unit cell is formed by connecting unit cells of the inwards concave honeycomb structure (1) or the chiral lattice (2), and the plurality of geometric unit cells are periodically auxetic to form the continuous fiber reinforced composite material auxetic structure;
the edge of the single cell single-layer wall thickness of the concave honeycomb structure (1) forms an acute angle with the horizontal line
In the same way, the first and second,
is 0-90 degrees, and the single cells of the concave honeycomb structure (1) pass through the inner partThe concave honeycomb structure basic rod pieces (3) are connected, the single cells of the chiral lattice (2) are connected through the chiral lattice basic rod pieces (6), and the concave honeycomb structure basic rod pieces (3), the chiral lattice basic rod pieces (6) and edge lines form acute angles
In the same way, the first and second,
the angle is 0-45 degrees, and the cross structures of the concave honeycomb structure basic rod piece (3) and the chiral lattice basic rod piece (6) are connected in a cross, star or cross-shaped mode;
the concave honeycomb structure (1) and the chiral lattice (2) are formed by alternately adopting single-layer and double-layer structure wall thicknesses, the single-layer and double-layer structure is made of a thermoplastic matrix (5) and continuous fibers (4), the single-layer wall thickness is 1.38mm, and the double-layer wall thickness is 2.36 mm.
2. The method of claim 1, wherein in step S1, the relevant adjustable geometric parameters include lengths of the concave honeycomb structure and the chiral lattice unit bars, wall thickness of the single-double layer structure formed by the thermoplastic matrix and the continuous fibers, acute angles formed by edges of the wall thickness of the single layer of the concave honeycomb structure unit cells and the horizontal line, acute angles formed by the bars for connecting the chiral lattice unit cells and the edge line, and heights of the single layer concave honeycomb structure and the chiral lattice.
3. The method according to claim 1, wherein in step S3, the printing process parameters include printing speed, printing temperature, platform temperature and packing density, the printing speed is 30-100 mm/min, the printing temperature is 200-210 ℃, the platform temperature is 35-50 ℃ and the packing density is 60-100%.
4. The method of claim 1, wherein in step S3, the electrically conductive continuous fibers comprise metal fiber filaments and carbon fibers; the heat-sensitive shape memory polymer includes shape cross-linked polyethylene, copolyamide, polyurethane, polycaprolactone, polynorbornene, trans-1, 4-polyisoprene, styrene-butadiene copolymer, ethylene/vinyl acetate copolymer and fluorine-containing polymer.
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